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Revenue - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Capitalized Contract Cost [Line Items]            
Current contract assets $ 900   $ 900   $ 1,700 $ 900
Non-current contract assets 0   0   0 0
Current contract liabilities 2,500   2,500   2,200 1,900
Non-current contract liabilities $ 0   0   0 $ 0
Revenue recognized included in contract liability     $ 1,000      
Practical Expedient, Incremental Costs     true      
Amortization Period 3 years   3 years      
Current capitalized costs $ 23   $ 23   177  
Non-current capitalized costs 0   0   $ 0  
Incremental costs amortized $ 50 $ 121 154 $ 229    
Impairment related to costs capitalized     $ 0 $ 0    
Payment terms     30 days      
Remaining Performance Obligation, Optional Exemption     true      
Europe | Maximum            
Capitalized Contract Cost [Line Items]            
Payment terms     90 days